BU shows a pair of aces (Kh Qc)Hero shows three of a kind, aces (Jd Ah)Hero wins with three of a kind, aces (Jd Ah).

The question I have here is about the cold call preflop. There was no solid information about the button raiser, but generally on NL25 on FTP button steal-raise is rather common. I did not want to fold AJ facing a button raise, but somehow I didn't think the hand was strong enough to move all-in preflop, especially with a call from SB. So I decided to risk 2 more big blinds and evaluate the hand on the flop. Obviously, with this flop the decision was easy. However, what do you think of the play in general, is cold call an option here, or should I always push (or fold) in this situation?

SSS is all about pushing or folding. Well, since BU is most probably stealing you can resteal against unknown with AJ+/88+ and SB's call you can simply treat as dead money which makes your resteal even more profitable. And we always resteal by pushing preflop, so push it is.

If you however still don't feel comfortable implementing steals and resteals in your game it's never a mistake to stick to basic strategy and fold AJ to a raise.